San Juan Capistrano, CA 92675 Frost Dates
San Juan Capistrano, CA: when does the frost end?
Around 01/06 is the usual last spring frost, about 131 days away. Fall's first freeze usually shows up around 01/02, roughly 365 days after the last spring frost.
Zone 10b (35 to 40°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for San Juan Capistrano, not a forecast for this year.
Stretching the season past the first frost
With roughly 18 weeks until San Juan Capistrano's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around San Juan Capistrano's last frost
01/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/13 and only about 1 year in 10 sees frost after that.
San Juan Capistrano against the rest of the dataset
About 365 days separate San Juan Capistrano's last and first frost, putting it 1,005 of 40,283 ZIP codes nationally. Within CA, it ranks 425 of 2,555.
Learn more
Before leaning on 92675's figures: zone vs. frost date explains why Zone 10b and San Juan Capistrano's frost date answer different questions, while the frost range explains how to read the range around San Juan Capistrano's dates instead of trusting one.